due to the odd name of the package *jython2.7.1+replack), I downloaded the source to see what was up. Here is the output:
=====================
Reading package lists... Done
NOTICE: 'jython' packaging is maintained in the 'Git' version control system at:
https://anonscm.debian.org/git/pkg-java/jython.git
=================
Is this an official jython distribution?
As it proceeds, it applies.. patches:
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dpkg-source: info: applying 00-missing-dep.patch
dpkg-source: info: applying 01-classpath.patch
dpkg-source: info: applying 03-default-cachedir.patch
dpkg-source: info: applying 05-no-com.carrotsearch.sizeof.patch
W: Download is performed unsandboxed as root as file 'jython_2.7.1+repack-3.dsc'
===============
Could this be the cause?